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Rapid Communication

Design, synthesis and in vitro biological studies of novel triazoles with potent and broad-spectrum antifungal activity

, , , , , , , , , , , & ORCID Icon show all
Article: 2244696 | Received 10 Jun 2023, Accepted 31 Jul 2023, Published online: 08 Aug 2023

Figures & data

Figure 1. Structures of the triazole antifungal agents and novel triazole compounds.

Figure 1. Structures of the triazole antifungal agents and novel triazole compounds.

Figure 2. Design strategy of target compounds.

Figure 2. Design strategy of target compounds.

Scheme 1. Synthesis of the target compounds. (a) (i) Et3N, MsCl, DCM, 0 °C, 1 h; (ii) NaOH, H2O, 0 °C, 4 h; (b) NH4Cl, NaN3, DMF, 80 °C, 10 h; (c) Pd/C, H2, MeOH, r.t., 8 h; (d) Substituted propionic acid, PyBOP, DIEA, DMF, r.t., 5 h.

Scheme 1. Synthesis of the target compounds. (a) (i) Et3N, MsCl, DCM, 0 °C, 1 h; (ii) NaOH, H2O, 0 °C, 4 h; (b) NH4Cl, NaN3, DMF, 80 °C, 10 h; (c) Pd/C, H2, MeOH, r.t., 8 h; (d) Substituted propionic acid, PyBOP, DIEA, DMF, r.t., 5 h.

Figure 3. The single-crystal structure of amine 4.

Figure 3. The single-crystal structure of amine 4.

Table 1. In vitro antifungal activity of the target compounds against tested fungi (MIC, μg/mL).

Table 2. In vitro antifungal activity of the potent compounds against FCZ-resistant C. albicans and C. auris isolates measured by MIC (μg/mL).

Figure 4. GC-MS analysis of sterols in C. albicans cells. The fungal strain was treated with DMSO (Control), FCZ, compounds A1, A3 or A9 at 8 μg/mL for 8 h.

Figure 4. GC-MS analysis of sterols in C. albicans cells. The fungal strain was treated with DMSO (Control), FCZ, compounds A1, A3 or A9 at 8 μg/mL for 8 h.

Figure 5. Haemolytic effect of A1, A3 and A9 against rabbit red blood cells at different indicated concentrations.

Figure 5. Haemolytic effect of A1, A3 and A9 against rabbit red blood cells at different indicated concentrations.

Figure 6. Predicted binding mode of compounds A3 and A9 (blue) in the active site of CYP51. Yellow dashed lines represent the halogen bond interactions and magenta dashed lines represent the coordination bond. The image was generated using PyMol.

Figure 6. Predicted binding mode of compounds A3 and A9 (blue) in the active site of CYP51. Yellow dashed lines represent the halogen bond interactions and magenta dashed lines represent the coordination bond. The image was generated using PyMol.

Figure 7. The evaluation egg-chart of PSA and Alog P of tested compounds. The 95% and 99% confidence limit ellipses of blood-brain barrier and intestinal absorption models.

Figure 7. The evaluation egg-chart of PSA and Alog P of tested compounds. The 95% and 99% confidence limit ellipses of blood-brain barrier and intestinal absorption models.
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Supplemental Material

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